长春粉质粘土强度增长模拟试验

发布时间：2018-03-24 06:06

本文选题：重塑土　切入点：三轴剪切实验　出处：《吉林大学》2015年硕士论文

【摘要】：土木类高校在土力学教学中一般要耗费大量的原状土样进行土工试验。这就要求每个课程的教学周期要准备相当多的原状土样供学生试验使用。近年来，城市可提供这种原状土样的场地越来越少；且实验时间有明确限制，这就造成了学生的土工实验课程的土样不足，甚至一些学生动手操作性试验被迫改为演示性试验，严重的影响了学生的能力培养。作为验证性实验，若用于实际工程的目的，实验则必须使用原状土样获取相关参数，而作为人才能力培养的手段之一，我们考虑用改良的重塑土来代替原状土样进行能力培养和训练，在基本达到实验教学规定的内容条件下，尽可能的在土力学性质方面使重塑土的性状与原状土更为接近（模拟原状土强度），以实现与原状土实验具有相近的实验成果。此外，还要使重塑土样具有较好的力学重现性，经过多次反复使用，其重塑土样具有模拟原状土强度稳定，不衰减的特性。这样我们就可以在获取原状土困难的情况下，，探索出用替代土样进行土三轴实验的人才能力训练的可行方法。本文通过三轴试验对原状粉质粘土的强度和重塑土的强度分析，在重塑土中添入可逆性强度增长剂的方法来实现重塑土与原状土力学强度的一致性，来替代原状土样进行土的三轴抗剪强度试验。通过研究，在土中加入2%明胶和7%氯化钙，在保持与原状土同等含水量和密度条件下，其力学指标具有高度相近性，且具有多次反复使用的重现性。
[Abstract]:In the teaching of soil mechanics in civil engineering colleges and universities, a large number of undisturbed soil samples are generally used for geotechnical tests, which requires a considerable number of undisturbed soil samples to be prepared for use by students in the teaching cycle of each course. There are fewer and fewer sites where such undisturbed soil samples can be provided in cities, and there are clear limits on the duration of the experiments, which results in a shortage of soil samples for the students' geotechnical experiment courses, and even some students are forced to change their hands-on operational tests to demonstration tests. It seriously affects the ability of students. As a confirmatory experiment, if it is used for practical engineering purposes, the experiment must use the original soil sample to obtain the relevant parameters, and as one of the means of talent ability development, We consider using the improved remolded soil instead of the undisturbed soil to train and train the ability, under the condition that the content of the experiment teaching is basically reached. As far as possible, the properties of the remolded soil are closer to that of the undisturbed soil in terms of soil mechanical properties (simulating the strength of the undisturbed soil so that the experimental results are similar to those of the undisturbed soil experiment.) in addition, it is necessary to make the remolded soil sample have better mechanical reproducibility. After repeated use, the remolded soil samples have the characteristics of stable strength and no attenuation of the simulated undisturbed soil, so that we can obtain the undisturbed soil under difficult conditions. This paper explores a feasible method of talent ability training in soil triaxial experiment by replacing soil samples. In this paper, the strength of undisturbed silty clay and remolded soil are analyzed by triaxial test, and the mechanical strength of remolded soil is consistent with that of undisturbed soil by adding reversible strength increasing agent to the remolded soil. Through the research, adding 2% gelatin and 7% calcium chloride into the soil, the mechanical index of the soil is highly similar to that of the undisturbed soil under the condition of keeping the same water content and density as the undisturbed soil. And it has the reproducibility of repeated use.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU411

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